Improvements

• Improve transaction execution performance when a non-existent account is accessed.
• Improve txpool garbage collection behavior.
• Add txpool RPC group for querying transaction-pool-related information.
• Enable block number index by default.

Bug fixes

• Fix an issue that may prevent archive nodes to sync (#2249).
• Fix an issue that an archive may crash after several quick restarts (#2244).
• Fix duplicate log result for duplicate blockhash parameter (#2238).
• Fix an issue that block number index may be incorrect after pivot switch (#2236).